I just got my k&n jet kit today and have started my first attempt at jetting my 400ex. My only mods are a k&n filter with outerwear and a WB slip on exhaust. Airbox lid is on with no holes drilled (yet). I followed the stage 2 directions that came with the kit and redid the needle valve to the third notch and put the washer on top of the e-clip. I jetted to a 170 and that didn't seem to be right so I worked my way down to a 155. I seem to be having the same problem with every size. The quad will idle fine but when I rev it up into the higher rpm's it seems to start cutting out. I noticed when I changed the jet it didnt seem to be seated in the bowl straight. I did not cross thread it or anything it just seems to be sitting in there crooked. Is it supposed to be seated crooked? What is causing it to cutout at high rpm's? My stock jet was a 148 and I've tried all the larger ones with no luck. Can someone with a similiar setup tell me what their settings are. Sorry this was so long!!